Refrigerating system



July 24, 1934. G MUFFLY REFRIGERATING SYSTEM Filed Oct. 29, 1928 if In Patented July 24, 1934 UNITED STATES PATENT OFFICE REFRIGERATING SYSTEM of Michigan Application October 29, 1928, Serial No. 315,839

8 Claims.

My invention; relates to refrigerating systems and more particularly to a combination of the operating motor and means for permitting rotation thereof without causing a movement of refrigerant through the system until a predetermined speed of rotation of the motor has been attained.

It is desirablein the construction of compressor type refrigerating systems to utilize the smallest possible motor for operating the compressor, and it isalso desirable to house the motor so as to make unnecessary the oiling of the same and to deaden the noise incident to the operation thereof. It very often happens that the refrigerant in the system attains a considerable pressure dine-=- ing the time when the motor and compressor are idle so that when the motor and compressor are brought into operation a considerable amount of power isinitially required to start the same. For this reason it has often times been necessary to employ much larger motors than are needed for normal operation of the compressor.

Among the objects of my invention is the provision of means whereby when the motor is idle refrigerant from the expansion coils of the reirigerating system will be prevented from passing into the compressor, which condition will continue to exist even after the motor has been started, until a predetermined speed has been attained by the motor. Another object is to provide a completely housed or enclosed motor in conjunction with a compressor integral therewith and directly driven by said motor so as to require no external unfixed seals between the motor and the compressor.

With the above and other objects in view my invention consists in the arrangement, combination andconstruction of the various parts of my improved device as described in the specification, claimed in my claims and shown in the accompanying drawing, in which:

Fig. 1 is an elevation showing more or less diagrammatically a refrigerating system to which my invention is applied.

Fig.- 2 is a central sectional view of the motor and compressor utilized in my invention.

Fig. 3 is a view taken on line 3-3 of Fig. 2.

Fig. 4 is an enlarged detail view of the valve mechanism controlling'flow. of refrigerant into the compressor. p

I have shown a motor 6, which may be oi the conventional electric type, inolosed in a housing or casing 5. I have also shown a'compressor 8, which may be directly connectedto the motor sheft'i, and may be of a conventional rotary type.

A plate 9 extends across one end of the housing 5, being secured to said housing by a cap 10 and nuts 11 threaded on the studs 12. The compressor 8 may be secured to this plate 9 by studs 13.

A valved outlet 14 is provided in one end of the. compressor 8 through which compressed refrigerant may pass into the chamber 15, which is en compassed by the cap 10. This refrigerant passes through pipe 16 into the condenser coils l7 and thence into the receiver unit 18, through expansion valve 19 into the expansion coils 20 and through pipe 21 to the housing 5. Refrigerant in the housing 5 will be drawn by the compressor 8 through the opening 22 into the compressor, where it will be again compressed and passed out as above described. 'Ihe valve 50 in the outlet 14 will, of course, be opened by pressure from within the compressor and closed by pressure from without the same when the outside pressure is greater than the inside pressure, as is conventional practice.

The refrigerant entering the housing 5 from pipe 21 will pass over the valve member 23, which is adapted to seat as at 24 in the passage 25 which connects the pipe 21 with the housing 5. A spring 26 normally tends to close the valve 23, which tendency willbe overcome by the pressure of the bearing points 27 provided on the arms 28, which are pivoted as at 29, to the motor shaft 7. The arms 28 will be drawn out by centrifugal force when the motor has attained a predetermined speed, so as to lift the bearing points 27 from. theposition shown in the drawing until they bear against the bottom of the valve stem 30, raising the valve 23 off its seat and permitting refrigerant from the pipe 21 to enter the ousing 5. It will be readily apparent that when the motor is idle the arms 28 are dropped to the position shown in the drawing so that the hearing points 27 will fall away from the valve stem 30 and the valve 23 will be closed to prevent the entrance of refrigerant from the pipe 21 to the housing 5. Thus high pressures of the refrigerant in the pipe 21 will not be manifested on the compressor 8 until the motor has attained such predetermined speed as is necessary to draw out the arms 28 and open the, valve 23.

It will be obvious that various changes may he made in the arrangement, combination and construction of the various parts of my improved device without departing from the spirit of my invention, and it is my intention to cover by my claims such changes as may reasonably be included within the scope thereof.

What I claim is:

1. In a refrigerating system, a sealed casing, means separating the easing into compartments, an electric motor in one. compartment having a shaft projecting into the other compartment, a compressor in the other compartment operatively connected to the motor shaft, the motor compartment having an inlet, an evaporator communicating with said inlet, and valve' means governed by the speed of the motor for opening and closing the inlet.

2. In a refrigerating system, a sealed casing, an electric motor in the casing having a shaft, a compressor connected to the motor shaft, the intake side of the compressor having operative communication with the interior of the casing, said casing having an inlet, an evaporator communicating with said inlet, and valve means governed by the speed of the motor for opening and closing the inlet.

3. In a refrigerating system, a sealed casing, an electric motor in the casing having a shaft, a compressor connected to the shaft, an evaporator exhaust valve connected to the casing, a valve betweensaid evaporator and casing, and means controlled by the speed of the motor for controlling the valve.

4. In a refrigerating system, a sealed casing, an electric motor in the casing having a shaft, a compressor in the casing, a casing wall between the compressor and motor, a duct connecting the intake side of the compressor and the interior of the motor compartment, an evaporator communicating with the interior of the motor compartment, and valve means governed by the speed of the motor for controlling the communication between the evaporator and the motor compartment.

5. In a refrigerating system, a sealed casing, an electric motor in the casing having a shaft, a compressor connected to the motor shaft, an evaporator connected to the casing, and having a valve controlling the flow of fluid therebetween, and means controlled by the speed of the motor for controlling the valve, the intake side of the compressor having an operative communication memes with said valve, said means comprising a centrifugally controlled element.

6. In a refrigerating system, an electric motor, a sealed casing containing the motor, said motor having a shaft, a compressor connected to the shaft, an evaporator connected to the casing, and having a valve controlling the flow of fluid therebetween, means controlled by the speed of the motor for controlling the valve, the intake side of the compressor having an operative communication with said valve, said valve being located at an end of the motor shaft.

'7. A refrigerating system comprising a refrigerant compressor having a high side and a low side, a refrigerant condenser connected to the high side of said compressor, a refrigerant evaporator connected to the' low side of said compressor, a refrigerant flow controlling device connected between said evaporator and said condenser, said system comprising means continuously obstructing the flow of refrigerant between the high and low sides of said compressor except through said flow controlling device, a valve controlling the flow of refrigerant between said evaporator and the low side of said compressor, and centrifugally actuated means associated with said system for controlling the operation of said valve.

8. A refrigerating system comprising a compressor having a high side and .a low side, a refrigerant condenser connected to the high side of said compressor, a refrigerant evaporator connected to the low side of said compressor, a refrigerant flow controlling device connected between said evaporator and said condenser, said system comprising means continuously obstructing the flow of refrigerant between the high and low sides of said compressor except through said flow controlling device, a valve controlling the flow of refrigerant between said evaporator and the low side of said compressor, means co-operating with said valve normally tending to prevent effective operation of the compressor, and means controlled by the operation of said system for opposing the operation of said means.

GLENN MUFFLY. 

